.row {
  width: 100%;
  //background-color: $black;
  display: flex;
  flex-wrap: wrap;
  &.left {
    justify-content: flex-start;
    & > .col {
      flex-grow: 0;
    }
  }
  &.right {
    justify-content: flex-end;
    & > .col {
      flex-grow: 0;
    }
  }
  &.center {
    justify-content: center;
    & > .col {
      flex-grow: 0;
    }
  }
  &.row-top {
    align-items: flex-start;
  }
  &.row-center {
    align-items: center;
  }
  &.row-bottom {
    align-items: flex-end;
  }
}

.col {
  flex-grow: 1;
  &.col-1 {
    flex: 0 0 8.33%;
  }
  &.col-offset-1 {
    margin-left: 8.33%;
  }
  &.col-2 {
    flex: 0 0 16.66%;
  }
  &.col-offset-2 {
    margin-left: 16.66%;
  }
  &.col-3 {
    flex: 0 0 25%;
  }
  &.col-offset-3 {
    margin-left: 25%;
  }
  &.col-4 {
    flex: 0 0 33.33%;
  }
  &.col-offset-4 {
    margin-left: 33.33%;
  }
  &.col-5 {
    flex: 0 0 41.66%;
  }
  &.col-offset-5 {
    margin-left: 41.66%;
  }
  &.col-6 {
    flex: 0 0 50%;
  }
  &.col-offset-6 {
    margin-left: 50%;
  }
  &.col-7 {
    flex: 0 0 58.33%;
  }
  &.col-offset-7 {
    margin-left: 58.33%;
  }
  &.col-8 {
    flex: 0 0 66.66%;
  }
  &.col-offset-8 {
    margin-left: 66.66%;
  }
  &.col-9 {
    flex: 0 0 75%;
  }
  &.col-offset-9 {
    margin-left: 75%;
  }
  &.col-10 {
    flex: 0 0 83.33%;
  }
  &.col-offset-10 {
    margin-left: 83.33%;
  }
  &.col-11 {
    flex: 0 0 91.66%;
  }
  &.col-offset-11 {
    margin-left: 91.66%;
  }
  &.col-12 {
    flex: 0 0 100%;
  }
}
.col-xs-1,
.col-xs-2,
.col-xs-3,
.col-xs-4,
.col-xs-5,
.col-xs-6,
.col-xs-7,
.col-xs-8,
.col-xs-9,
.col-xs-10,
.col-xs-11,
.col-xs-12,
.col-sm-1,
.col-sm-2,
.col-sm-3,
.col-sm-4,
.col-sm-5,
.col-sm-6,
.col-sm-7,
.col-sm-8,
.col-sm-9,
.col-sm-10,
.col-sm-11,
.col-sm-12,
.col-md-1,
.col-md-2,
.col-md-3,
.col-md-4,
.col-md-5,
.col-md-6,
.col-md-7,
.col-md-8,
.col-md-9,
.col-md-10,
.col-md-11,
.col-md-12,
.col-lg-1,
.col-lg-2,
.col-lg-3,
.col-lg-4,
.col-lg-5,
.col-lg-6,
.col-lg-7,
.col-lg-8,
.col-lg-9,
.col-lg-10,
.col-lg-11,
.col-lg-12 {
  width: 100%;
  flex-grow: 0;
  float: left;
}

//超小屏幕（手机，小于 768px）
.col-xs-1 {
  width: 8.33%;
}
.col-xs-2 {
  width: 16.66%;
}
.col-xs-3 {
  width: 25%;
}
.col-xs-4 {
  width: 33.33%;
}
.col-xs-5 {
  width: 41.66%;
}
.col-xs-6 {
  width: 50%;
}
.col-xs-7 {
  width: 58.33%;
}
.col-xs-8 {
  width: 66.66%;
}
.col-xs-9 {
  width: 75%;
}
.col-xs-10 {
  width: 83.33%;
}
.col-xs-11 {
  width: 91.66%;
}
.col-xs-12 {
  width: 100%;
}
.container, .container-fluid {
  width: 100%;
  margin: 0 auto;
}
.container.flex, .container-fluid.flex{
  flex: auto;
}
///* 小屏幕（平板，大于等于 768px） */
@media (min-width: $screen-sm-min) {
  .container {
    width: 750px;
  }
  .col-sm-1 {
    width: 8.33%;
  }
  .col-sm-2 {
    width: 16.66%;
  }
  .col-sm-3 {
    width: 25%;
  }
  .col-sm-4 {
    width: 33.33%;
  }
  .col-sm-5 {
    width: 41.66%;
  }
  .col-sm-6 {
    width: 50%;
  }
  .col-sm-7 {
    width: 58.33%;
  }
  .col-sm-8 {
    width: 66.66%;
  }
  .col-sm-9 {
    width: 75%;
  }
  .col-sm-10 {
    width: 83.33%;
  }
  .col-sm-11 {
    width: 91.66%;
  }
  .col-sm-12 {
    width: 100%;
  }
}

///* 中等屏幕（桌面显示器，大于等于 992px） */
@media (min-width: $screen-md-min) {
  .container {
    width: 970px;
  }
  .col-md-1 {
    width: 8.33%;
  }
  .col-md-2 {
    width: 16.66%;
  }
  .col-md-3 {
    width: 25%;
  }
  .col-md-4 {
    width: 33.33%;
  }
  .col-md-5 {
    width: 41.66%;
  }
  .col-md-6 {
    width: 50%;
  }
  .col-md-7 {
    width: 58.33%;
  }
  .col-md-8 {
    width: 66.66%;
  }
  .col-md-9 {
    width: 75%;
  }
  .col-md-10 {
    width: 83.33%;
  }
  .col-md-11 {
    width: 91.66%;
  }
  .col-md-12 {
    width: 100%;
  }
}

///* 大屏幕（大桌面显示器，大于等于 1200px） */
@media (min-width: $screen-lg-min) {
  .container {
    width: 1170px;
  }
  .col-lg-1 {
    width: 8.33%;
  }
  .col-lg-2 {
    width: 16.66%;
  }
  .col-lg-3 {
    width: 25%;
  }
  .col-lg-4 {
    width: 33.33%;
  }
  .col-lg-5 {
    width: 41.66%;
  }
  .col-lg-6 {
    width: 50%;
  }
  .col-lg-7 {
    width: 58.33%;
  }
  .col-lg-8 {
    width: 66.66%;
  }
  .col-lg-9 {
    width: 75%;
  }
  .col-lg-10 {
    width: 83.33%;
  }
  .col-lg-11 {
    width: 91.66%;
  }
  .col-lg-12 {
    width: 100%;
  }
}

@media (max-width: $screen-xs-max) {
  .hidden-xs{
    visibility: hidden;
  }
}

@media (min-width: $screen-sm-min) and (max-width: $screen-sm-max) {
  .hidden-sm{
    visibility: hidden;
  }
}

@media (min-width: $screen-md-min) and (max-width: $screen-md-max) {
  .hidden-md{
    visibility: hidden;
  }
}

@media (min-width: $screen-lg-min) {
  .hidden-lg{
    visibility: hidden;
  }
}
